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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
</font></b></font><font color="#3333ff"><b>March 2, 2012<br>
CEBAF Center Auditorium<br>
11:00AM<br>
Cookies and Coffee 10:45AM</b><br>
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<b>"Delivering Full Longitudinal Polarized Beam to Multiple Halls"
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<font color="#3333ff">Jay Benesch
<br>
Jefferson Lab</font>
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Polarization in the three halls is often compromised as there is only
one Wien filter to set the initial horizontal precession angle.
Following a suggestion of R. Kazimi I have been exploring the
possibility of placing three Wien filters, one per hall. This would
ease experiment scheduling substantially and reduce the time needed to
complete each experiment since 100% longitudinal spin alignment would
be possible for any energy/pass configuration to three halls. I will
present an overview of the current injector area and then a model of a
Wien filter small enough to fit three on the chopping circle, discuss
parameter studies done to date, and show a model of three Wien filters
with three chopped beams from the master slit openings. Resources
needed to move the work forward in FY12 and FY13 will be suggested.
Installation of the 200keV gun and new quarter cryounit are planned for
2015 so a decision on this idea is needed by the end of FY13 if it is
to be incorporated in the (less disruptive) existing project.
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